"He searched for me... What the grandmothers say came to be: 'They will come search for us as we continue to search for them,'" Estela Carlotto told reporters.
Her grandson disappeared 36 years ago after he was born to Carlotto's daughter, Laura, while she was imprisoned under a military dictatorship for her membership in Montoneros, an urban guerrilla group. Laura was two-and-a-half months pregnant when she was arrested.
She gave birth on June 26, 1978 to a boy she named Guido. After the birth, her baby was taken away and Laura was executed two months later.
Guido Montoya Carlotto, now 36, grew up as Ignacio Hurban. Questioning his life story, Hurban reached out to the group in June to find out more about his birth mother.
A DNA test confirmed he was Carlotto's grandson.
"He's beautiful," she said after meeting her grandson.